(19)

(11)

EP 0 756 804 A1

(12)

(43) Date of publication: 05.02.1997 Bulletin 1997/06 (21) Application number: 95915953.0 (22) Date of filing: 21.04.1995

(51) International Patent Classification (IPC):  G06F 9/ 06( . ) H04M 3/ 00( . ) H04Q 3/ 00( . ) G06F 13/ 00( . ) H04M 3/ 42( . ) H04Q 3/ 545( . ) (86) International application number: PCT/GB1995/000913 (87) International publication number: WO 1995/029564 (02.11.1995 Gazette 1995/47)

(84) Designated Contracting States: BE CH DE ES FR GB IT LI NL SE (30) Priority: 21.04.1994 EP 19940302848 (71) Applicant: BRITISH TELECOMMUNICATIONS public limited company London EC1A 7AJ (GB)

(72) Inventors: WATERS, Donald, George, Paul Woodbridge Suffolk IP12 2EW (GB) PAVIER, Jeremy Ipswich Suffolk IP4 4NT (GB) TURNER, Graham, David Woodbridge Suffolk IP12 3AS (GB) COX, Richard, Dewitt Garland, TX 75044 (US) HUNTER, Andrew, Timothy Dallas, TX 75240 (US) RAND, Jeffrey, Kevin Coppeol, TX 75019 (US) (74) Representative: Dutton, Erica L. G., et al  BT Group Legal Services, Intellectual Property Department, 8th Floor, Holborn Centre 120 Holborn London EC1N 2TE London EC1N 2TE (GB)